PMC-Sierra, Inc.
PRELIMINARY
PM5381 S/UNI-2488
DATASHEET
PMC-2000489
ISSUE 1
SATURN USER NETWORK INTERFACE FOR 2488 MBIT/S
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
1 flag
2 flags
4 flags
8 flags
16 flags
32 flags
64 flags
128 flags
256 flags
512 flags
1024 flags
2048 flags
4096 flags
8192 flags
16384 flags
32768 flags
CRC_SEL[1:0]:
The CRC select (CRC_SEL[1:0]) bits allow the control of the CRC calculation according to
the table below. For ATM cells, the CRC is calculated over the first four ATM header bytes.
For packet applications, the CRC is calculated over the whole packet data, before byte
stuffing and scrambling.
Table 12: CRC Mode Selection
CRC_SEL[1
:0]
HCS Operation
FCS Operation
00
01
10
11
Reserved
No FCS inserted
No FCS inserted
CRC-CCITT (2 bytes)
CRC-32 (4 bytes)
Reserved
CRC-8 without coset polynomial
CRC-8 with coset polynomial added
POS_SEL:
The POS_SEL bit enables the POS HDLC frame processing mode. When POS_SEL is set
to logic 1, POS processing will occur. When POS_SEL is set to logic 0, ATM mode is
selected.
Reserved:
The Reserved bits should be set to logic 0 for proper operation.
Proprietary and Confidentail to PMC-Sierra Inc., and for its Customer’s Internal Use
326
PMC [ PMC-SIERRA, INC ]
